I'm okay with Mollydog's suggestion... Just have to tighten your sphincter a bit when a roadside Migracion checkpoint shows up and bluff through.
As far as leaving MEXICO at the southern border you will actually be okay because for travellers going into CA it is not required to hand in the TVIP, on the assumption that you would just have to go through the whole process of getting a new TVIP for the return trip to Mexico .
When leaving MEXICO to enter Belize and GUATEMALA you MUST TURN IN AND CANCEL THE TOURIST CARD .
So , your task is to clam up and DO NOT volunteer any information about not having a TVIP . The BZ and GT officials do not ask to see a cancelled MEXICO TVIP. Once you are into CA it matters not an iota .
Then on the return trip and entering MEXICO you are all honest and clear and you simply obtain the MEXICAN TVIP and pay the security bond. Refundable ,for the return run to the USA
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And then do take the trouble to stop at the MEXICAN customs facility to CANCEL THE TVIP AND COLLECT YOUR REFUND . Pay attention, hone u on the rules.
No MEXICAN official is going to run out in front of you demanding you cancel any documents . The U.S. CUSTOMS guys have nothing to do with it and they know nothing about the process , or so they make one think.

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http://advrider.com/index.php?thread....207964/page-5 then scroll down to post #93